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fryj00 fryj00 is offline
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Car: 2011 e92 n55 xDrive 6MT
Default Wrapping up 2011 335xi upgrade/refresh project - 07-22-2019, 08:53 PM

So my 2011 E92 was/is starting to show some age and is in need of some attention. I started replacing suspension components last year as the handling was getting pretty mushy but I feel that is taken care of for now. This year, it's time for the engine bay to get some love as I haven't really done any work under there since I put the Stg 1 compressor in three years ago.

To set the stage (mood) for this project - I live in Pittsgurgh (salt/snow), the car has 110k, this is an XI (front drive axle right under the turbo) and I have to do this almost entirely alone and on my back (jack stands). Read that as "difficulty = ridiculous". Tight spaces, rusty bolts and nuts, brittle wires and connectors, and, oh yeah, expensive.

Quick list of parts:

Pure stg 2 turbo
HPFP (my third)
Water pump and thermostat
All new coolant hoses
Coils
Spark plugs
Almost all new fasteners
Semi-solid motor mounts
Intercooler and exhaust clamps
****load of gaskets, o-rings, and such

Like most projects, this turned into more than I really intended. Problems kept popping up as did things I forgot or just never thought of. I had most of the tools already. The only things I had to go buy were an engine support bar and a long-ass 1/2-inch extension to get to the motor mount nuts.

If I had a lift and had taken the subframe completely off from the beginning, life would have been much easier but I don't have a lift and did not wa nt to try to re-install the subframe by myself (hard to get located). I ended up removing the rear four bolts from the subframe and let it hang from the font two (and suspension links). Without at least lowering the subframe, you can't get to the water pump bolts and you can't remove the motor mounts or the turbo. In point of fact, the real difficulty in this whole project is trying to figure out what the sequence of events is going to be...because the access to just about every fastener is so restricted, it is literally a ****ing puzzle to figure out how to get each one out.

Expect to break at least three exhaust studs trying to get the turbo out. Replace them all. Anti-sieze every ****ing thing.

Anyway, I got the beast running tonight but it has a couple of issues still too sort out. I'm beat and will post more later. Feel free to hit me with questions.

It was good to hear her run - it's been a while.



2011 E92 N55 xDrive 6MT
Pure Stg 2 | DV+ | Pure inlet | MHD/JB4
Stage 2 lpfp | BMS Intake | Shifteck 4-inch "expansion chamber" | MXP catback
VRSF 7" FMIC | ECS 2-piece rotors
255/40-18 square | 8.5x18 ET35
Fortune Auto MSC-1 coilovers 8k/10k
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fryj00 fryj00 is offline
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Car: 2011 e92 n55 xDrive 6MT
Default 08-07-2019, 10:37 PM

The car has been running a couple of weeks now...no leaks (thank God).

I haven't done anything with the JB4. I'm running it just as it was with the stage 1 turbo mainly because I haven't had time to tune it. Map two gets me 19psi and pulls very strong all the way out. It's a missile. I have to admit, though, I'm not in love with the turbine response. I knew I would lose some but to feel that low-end missing is going to be an adjustment.

The big surprise is the HPFP. It's a $300 knock-off and it's holding up at 19psi with ~30% ethanol. Wasn't expecting that. Now let's see how long it lasts.



2011 E92 N55 xDrive 6MT
Pure Stg 2 | DV+ | Pure inlet | MHD/JB4
Stage 2 lpfp | BMS Intake | Shifteck 4-inch "expansion chamber" | MXP catback
VRSF 7" FMIC | ECS 2-piece rotors
255/40-18 square | 8.5x18 ET35
Fortune Auto MSC-1 coilovers 8k/10k
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fryj00 fryj00 is offline
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Car: 2011 e92 n55 xDrive 6MT
Default 08-13-2019, 01:12 PM

Did another log pull last night. Trying to sneak up on the limits of fuel, timing, and boost. I was in map7 (20 psi) and the JB4 kicked into map4 at about 4500 rpm. Looks like it overboosted (21.4 psi) and the boost safety stepped in.

The crazy thing is that there was very little fuel trimming (+), the hpfp was stable at around 1800 psi, and avg ign was <1.5 degrees. Mind you this is with no supplemental fueling and ~E60-65. It was pulling hard too...before it shut down. I'll be working to tune out the overboosting with FF and duty bias.

Since I'm running the stock TMAP, this is about as good as it's going to get for now but I couldn't be happier. The car is seriously fast.



2011 E92 N55 xDrive 6MT
Pure Stg 2 | DV+ | Pure inlet | MHD/JB4
Stage 2 lpfp | BMS Intake | Shifteck 4-inch "expansion chamber" | MXP catback
VRSF 7" FMIC | ECS 2-piece rotors
255/40-18 square | 8.5x18 ET35
Fortune Auto MSC-1 coilovers 8k/10k
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fryj00 fryj00 is offline
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Car: 2011 e92 n55 xDrive 6MT
Default 08-14-2019, 07:12 PM

Just back from some logging runs to adjust the boost curve. Avg_ign, FP_H, Trim, and AFR look great. Really clean log. I will make a few tiny adjustments to duty bias to bring the boost inline with target but I couldn't be happier.

Cars pulls like a beast. Wants to spin all four a bit when you tip in with some rpm.

All without supplemental fueling.
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Attached Files
File Type: csv 2019-08-14 21_11_06_Map-7.csv (16.0 KB, 23 views)



2011 E92 N55 xDrive 6MT
Pure Stg 2 | DV+ | Pure inlet | MHD/JB4
Stage 2 lpfp | BMS Intake | Shifteck 4-inch "expansion chamber" | MXP catback
VRSF 7" FMIC | ECS 2-piece rotors
255/40-18 square | 8.5x18 ET35
Fortune Auto MSC-1 coilovers 8k/10k
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fryj00 fryj00 is offline
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Car: 2011 e92 n55 xDrive 6MT
Default 08-26-2019, 08:14 PM

Found the upper limit of the hpfp. I put a little too much E85 in the tank (~E60-70) and the car started cutting out under high boost (20psi). Ran the fuel down a few gallons and topped off with 93. Problem solved.

The pure stg 2 is probably good for 23-25psi before misfires but I'll have to spend a lot of dough just to use that little extra. I suppose the current config will do for a year or so until I get bored.

Signing off for now.

-Bryan



2011 E92 N55 xDrive 6MT
Pure Stg 2 | DV+ | Pure inlet | MHD/JB4
Stage 2 lpfp | BMS Intake | Shifteck 4-inch "expansion chamber" | MXP catback
VRSF 7" FMIC | ECS 2-piece rotors
255/40-18 square | 8.5x18 ET35
Fortune Auto MSC-1 coilovers 8k/10k
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houtan houtan is offline
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Car: 135i
Default 08-29-2019, 07:25 AM

Thanks for the updates and glad she’s running good. What flash are you running? Is the timing advance 1.1 degrees or am I reading your log incorrectly?
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Car: 2011 e92 n55 xDrive 6MT
Default 08-29-2019, 06:13 PM

I'm running the Burger-provided E85 MHD flash with ~E50.

The metric you are looking at is named badly. It's Ign Advance but it is actually showing how much timing the DME is pulling during the run...so less is better. 1-5 degrees is typical. More than that is a good indication of detonation and the JB4 will kick into map4 (stock boost) as a safety measure.

In short, 1.1 means my octane level is good.

-Bryan



2011 E92 N55 xDrive 6MT
Pure Stg 2 | DV+ | Pure inlet | MHD/JB4
Stage 2 lpfp | BMS Intake | Shifteck 4-inch "expansion chamber" | MXP catback
VRSF 7" FMIC | ECS 2-piece rotors
255/40-18 square | 8.5x18 ET35
Fortune Auto MSC-1 coilovers 8k/10k
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houtan houtan is offline
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Car: 135i
Default 08-29-2019, 09:12 PM

Thanks. So how much timing advance dies the tune have?
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Default 08-30-2019, 08:15 AM

Here is a screenshot from Tuner Pro (load vs RPM)

N55's don't need much compared to many other engines and more is not necessarily better.

I'm sure I could squeeze more power out of it with some dyno tuniing of AFR's and timing but I don't feel like the time and money would be worth it. This has proven to be a safe, solid tune.
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2011 E92 N55 xDrive 6MT
Pure Stg 2 | DV+ | Pure inlet | MHD/JB4
Stage 2 lpfp | BMS Intake | Shifteck 4-inch "expansion chamber" | MXP catback
VRSF 7" FMIC | ECS 2-piece rotors
255/40-18 square | 8.5x18 ET35
Fortune Auto MSC-1 coilovers 8k/10k
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houtan houtan is offline
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Car: 135i
Default 08-30-2019, 08:52 AM

Yeah 11.0 up top is where I like to keep it on my car. With that timing and 18 ish psi you should be able to get away with e30 no problem. On my car it’s fine at least, but I am flash only. Stack or flash only shouldn’t matter with respect to that though.
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Default 10-08-2019, 07:18 PM

Made a custom map with some slight changes up top - AFR .2 leaner (12.9) and 12 deg advance on about E50. Feels good and is trouble free up in cool weather. Not so much in the heat (85+). Could safely run 20psi with this tune in any weather if I could run straight E85 (max octane) but that will require port injection. I think I could even go leaner with that octane but I'm not going any higher on the ignition advance.



2011 E92 N55 xDrive 6MT
Pure Stg 2 | DV+ | Pure inlet | MHD/JB4
Stage 2 lpfp | BMS Intake | Shifteck 4-inch "expansion chamber" | MXP catback
VRSF 7" FMIC | ECS 2-piece rotors
255/40-18 square | 8.5x18 ET35
Fortune Auto MSC-1 coilovers 8k/10k
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